Combined lap and butt welded tube



JAMES MCCAIKTY, OFl READING,

PENNSYLVANIA.

COMBINED LAP AND BUTT WELDED TUBE.

Specification of Letters Patent No. 6,956, dated December 18, 1849.

To all lwhom t may concern Be it known that I, JAMES MCCARTY, ofReading, in the county of Berks and State of Pennsylvania, have inventeda new and Improved Mode of Making lVrought- Iron Pipes, and that thefollowing is a full, clear, and exact description of the principle orcharacter which distinguishes it from all other things before known andof the usual manner of making, modifying, and using the same, referencebeing had to the accompanying drawing, in which the improvement isshown.

In making wrought iron tubes by machinery, a lap-welded joint is foundvery difficult to form; while a but-weld is comparatively easy; butpipes made by the latter plan cannot be used in certain cases, as forinstance, for stretching or turning out, to forni a flanch, or bendingto form a curve; while for all other purposes it is as useful as themore expensive lap-weld. My improvement consists in forming pipe whichhas the advantages of both, by combining the two in the same pipe. Iform a but-weld upon the pipe throughout the whole length, except aboutsiX or leight inches at each end; this part I then scarf and lap over,and Weld with a regular lapweld, and the pipe is completed by drawing inthe usual way. The ends are when thus constructed fitted to draw andturn as occasion requires, the strength Afor which is only wanted at theends.

Having thus fully described my improve ments, in wrought iron pipes, Iwish it to be understood that I do not claim either a butwelded orlap-welded joint therein, as they are both old devices; but

Vhat I do claim is- A pipe composed of a combination of the but-weld,with lapfwelded ends, as above particularly set forth.

JAMES MCCART'Y.

lVitnesses:

DANIEL J. VERNER, CYRUS J. HUNTER.

